"could not open session" shows when nofile is set to unlimited in /etc/security/limits.conf

Issue

• When the nofile is set to unlimited in /etc/security/limits.conf file the user cannot login:

  user  soft nofile 1024
  user  hard nofile unlimited
  
  # su - user
  could not open session
  

• The messages in /var/log/secure:

  login: pam_unix(remote:session): session opened for user root by (uid=0)
  login: Permission denied
  login: pam_limits(remote:session): Could not set limit for 'nofile': Operation not permitted
  
  su: pam_limits(su:session): Could not set limit for 'nofile': Operation not permitted
  su: pam_unix(su:session): session opened for user root by test(uid=501)
  
  pam: gdm-password: pam_limits(gdm-password:session): Could not set limit for 'nofile': Operation not 
  permitted
  pam: gdm-password: pam_unix(gdm-password:session): session opened for user root by (uid=0)